After some security concerns after a break in, Sheldon finds himself sneaking out on his ledge.
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Penny and Leonard come outside to see Sheldon trapped by a net from the security system they installed.
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When Sheldon and Raj get a security system installed to combat intruders, it back fires on them.
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When the boys' apartment gets broken into, they call upon Wolowitz to help them install a security system.
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We never thought we'd see the day when Sheldon and Raj go to a University mixer together and meet some ladies, Martha (Jen Drohan) and Abby (Danica McKellar).
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That's right, Sheldon meets a girl, Martha (Jen Drohan) at a university mixer and ends up with her back at his place... with his hulk hands on.
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Might Raj be getting over his fear of women as he sits closely with the beautiful Abby (Danica McKellar) he met at a mixer.
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Raj takes the microphone as his new girl, Abby (Danica McKellar) that he met at a mixer, plays the drums.
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As usual, Leonard and Penny get into an argument. This time? About psychics.
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Sheldon defines the word cool when he puts on his toy hulk hands and in front of Raj.
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After meeting two girls at the university mixer, Raj and Sheldon invite them for a raging game of Rock Band at the apartment.
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Sheldon helps decorate the tree and wants to add the bust of Sir Isaac Newton, which he argues is more Christmasy than Jesus.
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TBBT Quotes

Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy?
Sheldon: There are post-prom mating rituals?
Penny: Not always. Unless your date drives a van with an air mattress, then always.
Sheldon: Well, if it's part of the prom experience, then I'm open to it.
Penny: You're kidding.
Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.

Penny: Hey, Sheldon, did you change your Wi-Fi password again?
Sheldon: Yes, it's "Penny, get your own Wi-Fi." No spaces.